forked from mirrors/linux
b778ae2536
In order to better respond to things like duplicate invocations of call_rcu(), RCU needs to see the status of a call to debug_object_activate(). This would allow RCU to leak the callback in order to avoid adding freelist-reuse mischief to the duplicate invoations. This commit therefore makes debug_object_activate() return status, zero for success and -EINVAL for failure. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Sedat Dilek <sedat.dilek@gmail.com> Cc: Davidlohr Bueso <davidlohr.bueso@hp.com> Cc: Rik van Riel <riel@surriel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Linus Torvalds <torvalds@linux-foundation.org> Tested-by: Sedat Dilek <sedat.dilek@gmail.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
110 lines
3.7 KiB
C
110 lines
3.7 KiB
C
#ifndef _LINUX_DEBUGOBJECTS_H
|
|
#define _LINUX_DEBUGOBJECTS_H
|
|
|
|
#include <linux/list.h>
|
|
#include <linux/spinlock.h>
|
|
|
|
enum debug_obj_state {
|
|
ODEBUG_STATE_NONE,
|
|
ODEBUG_STATE_INIT,
|
|
ODEBUG_STATE_INACTIVE,
|
|
ODEBUG_STATE_ACTIVE,
|
|
ODEBUG_STATE_DESTROYED,
|
|
ODEBUG_STATE_NOTAVAILABLE,
|
|
ODEBUG_STATE_MAX,
|
|
};
|
|
|
|
struct debug_obj_descr;
|
|
|
|
/**
|
|
* struct debug_obj - representaion of an tracked object
|
|
* @node: hlist node to link the object into the tracker list
|
|
* @state: tracked object state
|
|
* @astate: current active state
|
|
* @object: pointer to the real object
|
|
* @descr: pointer to an object type specific debug description structure
|
|
*/
|
|
struct debug_obj {
|
|
struct hlist_node node;
|
|
enum debug_obj_state state;
|
|
unsigned int astate;
|
|
void *object;
|
|
struct debug_obj_descr *descr;
|
|
};
|
|
|
|
/**
|
|
* struct debug_obj_descr - object type specific debug description structure
|
|
*
|
|
* @name: name of the object typee
|
|
* @debug_hint: function returning address, which have associated
|
|
* kernel symbol, to allow identify the object
|
|
* @fixup_init: fixup function, which is called when the init check
|
|
* fails
|
|
* @fixup_activate: fixup function, which is called when the activate check
|
|
* fails
|
|
* @fixup_destroy: fixup function, which is called when the destroy check
|
|
* fails
|
|
* @fixup_free: fixup function, which is called when the free check
|
|
* fails
|
|
* @fixup_assert_init: fixup function, which is called when the assert_init
|
|
* check fails
|
|
*/
|
|
struct debug_obj_descr {
|
|
const char *name;
|
|
void *(*debug_hint) (void *addr);
|
|
int (*fixup_init) (void *addr, enum debug_obj_state state);
|
|
int (*fixup_activate) (void *addr, enum debug_obj_state state);
|
|
int (*fixup_destroy) (void *addr, enum debug_obj_state state);
|
|
int (*fixup_free) (void *addr, enum debug_obj_state state);
|
|
int (*fixup_assert_init)(void *addr, enum debug_obj_state state);
|
|
};
|
|
|
|
#ifdef CONFIG_DEBUG_OBJECTS
|
|
extern void debug_object_init (void *addr, struct debug_obj_descr *descr);
|
|
extern void
|
|
debug_object_init_on_stack(void *addr, struct debug_obj_descr *descr);
|
|
extern int debug_object_activate (void *addr, struct debug_obj_descr *descr);
|
|
extern void debug_object_deactivate(void *addr, struct debug_obj_descr *descr);
|
|
extern void debug_object_destroy (void *addr, struct debug_obj_descr *descr);
|
|
extern void debug_object_free (void *addr, struct debug_obj_descr *descr);
|
|
extern void debug_object_assert_init(void *addr, struct debug_obj_descr *descr);
|
|
|
|
/*
|
|
* Active state:
|
|
* - Set at 0 upon initialization.
|
|
* - Must return to 0 before deactivation.
|
|
*/
|
|
extern void
|
|
debug_object_active_state(void *addr, struct debug_obj_descr *descr,
|
|
unsigned int expect, unsigned int next);
|
|
|
|
extern void debug_objects_early_init(void);
|
|
extern void debug_objects_mem_init(void);
|
|
#else
|
|
static inline void
|
|
debug_object_init (void *addr, struct debug_obj_descr *descr) { }
|
|
static inline void
|
|
debug_object_init_on_stack(void *addr, struct debug_obj_descr *descr) { }
|
|
static inline int
|
|
debug_object_activate (void *addr, struct debug_obj_descr *descr) { return 0; }
|
|
static inline void
|
|
debug_object_deactivate(void *addr, struct debug_obj_descr *descr) { }
|
|
static inline void
|
|
debug_object_destroy (void *addr, struct debug_obj_descr *descr) { }
|
|
static inline void
|
|
debug_object_free (void *addr, struct debug_obj_descr *descr) { }
|
|
static inline void
|
|
debug_object_assert_init(void *addr, struct debug_obj_descr *descr) { }
|
|
|
|
static inline void debug_objects_early_init(void) { }
|
|
static inline void debug_objects_mem_init(void) { }
|
|
#endif
|
|
|
|
#ifdef CONFIG_DEBUG_OBJECTS_FREE
|
|
extern void debug_check_no_obj_freed(const void *address, unsigned long size);
|
|
#else
|
|
static inline void
|
|
debug_check_no_obj_freed(const void *address, unsigned long size) { }
|
|
#endif
|
|
|
|
#endif
|